diff --git a/VoiceInk/Services/AIEnhancementService.swift b/VoiceInk/Services/AIEnhancementService.swift
index 82051b8..07b9243 100644
--- a/VoiceInk/Services/AIEnhancementService.swift
+++ b/VoiceInk/Services/AIEnhancementService.swift
@@ -134,7 +134,7 @@ class AIEnhancementService: ObservableObject {
     private func getSystemMessage(for mode: EnhancementPrompt) -> String {
         let clipboardSnapshot = NSPasteboard.general.string(forType: .string)
         let selectedText = SelectedTextService.fetchSelectedText()
-        
+
         if let activePrompt = activePrompt,
            activePrompt.id == PredefinedPrompts.assistantPromptId,
            let selectedText = selectedText, !selectedText.isEmpty {
diff --git a/VoiceInk/Services/SelectedTextService.swift b/VoiceInk/Services/SelectedTextService.swift
index c58dc31..19fd0e6 100644
--- a/VoiceInk/Services/SelectedTextService.swift
+++ b/VoiceInk/Services/SelectedTextService.swift
@@ -1,7 +1,9 @@
 import Foundation
 import AppKit
 class SelectedTextService {
-    
+    // Private pasteboard type to avoid clipboard history pollution
+    private static let privatePasteboardType = NSPasteboard.PasteboardType("com.prakashjoshipax.VoiceInk.transient")
+
     static func fetchSelectedText() -> String? {
         // Don't check for selected text within VoiceInk itself
         guard let frontmostApp = NSWorkspace.shared.frontmostApplication,